<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <header>
      <nav>
        <ol style="display:flex;flex-direction:row">
          <li><a href="">home</a></li>
          <li><a href="">home</a></li>
          <li><a href="">home</a></li>
          <li><a href="">home</a></li>
        </ol>
      </nav>
    </header>
    <div class="main">
      <h1>hello world!</h1>
    </div>
  </body>
</html>
